Seedcorn beetle
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The seedcorn beetle, in the genus
Stenolophus, is usually a pest of corn seeds, but the adult beetles sometimes invade golf course greens, where they produce small mounds of sand. In most cases, they do not cause direct damage to turf, and usually disappear in a short period of time. Greens that are near strong lights are most susceptible to invasion. The two photos above illustrate some of the variation in color and markings that are common in this group of beetles.
Turf Insects